When your blood sugar drops below 70 mg/dL, fast-acting carbohydrates are the quickest way to bring it back up. The standard approach is called the 15-15 rule: eat 15 grams of simple carbs, wait 15 minutes, then recheck your blood sugar. If it’s still under 70, repeat. Most people feel better within 10 to 20 minutes, but what you eat after that initial recovery matters just as much for staying stable.
The 15-15 Rule for Quick Recovery
The goal during a low is speed. You want sugar that hits your bloodstream fast, without fat or protein slowing it down. Fat delays how quickly your stomach empties, which means glucose from food reaches your blood more slowly. That’s helpful in everyday eating but counterproductive during a low. Stick to pure, simple carbohydrates first.
Each of these provides roughly 15 grams of fast-acting carbs:
- 3 to 4 glucose tablets
- 1 tube of glucose gel
- 4 ounces (half a cup) of fruit juice or regular soda
- 1 tablespoon of honey or sugar
- 5 Lifesavers candies
- 2 tablespoons of raisins
Glucose tablets are the most reliable option because they’re pre-measured and portable. Juice and regular soda work well too, but diet versions contain no sugar and won’t help. After eating your 15 grams, set a timer. Rechecking too early can lead to overtreating, which sends blood sugar swinging in the other direction. If your level is still below 70 mg/dL at the 15-minute mark, eat another 15 grams and wait again. Keep repeating until you’re back in your target range.
Young children typically need less than 15 grams per round, especially infants and toddlers. A pediatrician can give you the right amount for your child’s age and size.
What to Eat After Your Blood Sugar Comes Back Up
Once your reading is back above 70, the fast-acting sugar you just consumed will burn through quickly. Without a follow-up snack, your blood sugar can drop again within an hour or two. The ideal stabilizing snack pairs about 15 grams of carbohydrate with some protein. The protein slows digestion just enough to give you a steady release of glucose rather than another spike and crash.
Good options include:
- Half a sandwich with meat, cheese, or peanut butter
- 8 animal crackers with 2 tablespoons of peanut butter
- A small piece of fruit with an ounce of cheese
- 6 saltine crackers with a quarter cup of tuna salad
- 55 Goldfish crackers with an ounce of cheese
- 3 cups of plain popcorn with an ounce of nuts
If your next full meal is less than an hour away, you can skip the snack and eat your meal instead. The point is to get something more substantial into your system before the simple sugar wears off.
Handling Severe Lows
A blood sugar below 54 mg/dL is considered severe. At this level, you may feel confused, uncoordinated, or too disoriented to treat yourself. Some people lose consciousness. This is where glucagon becomes essential.
Glucagon is a hormone that signals your liver to release stored sugar into the bloodstream. It comes in forms that someone nearby can give you even if you can’t swallow. Nasal glucagon (sold as Baqsimi) is a dry powder sprayed into one nostril, with no mixing or measuring required. Pre-filled auto-injectors like the Gvoke HypoPen work like an EpiPen, delivering glucagon through a simple injection into the thigh or abdomen. Both are dramatically easier to use in a crisis than older glucagon kits, which required mixing powder with liquid under pressure.
If you take insulin or a medication that can cause lows, keeping glucagon accessible and making sure the people around you know where it is and how to use it can be lifesaving. Most people regain consciousness within 10 to 15 minutes after receiving glucagon.
Recognizing the Symptoms
Your body gives early warning signs when blood sugar starts dropping. Common symptoms include shakiness, sweating, a fast heartbeat, irritability, and sudden hunger. As levels fall further, you may notice blurred vision, difficulty concentrating, slurred speech, or numbness in your lips and tongue. Some people feel perfectly fine until they’re already in a dangerous range, a phenomenon called hypoglycemia unawareness that becomes more common after repeated lows.
Nighttime lows are particularly tricky because you’re asleep when the symptoms start. Clues that it happened overnight include waking up with a headache, damp sheets from sweating, or feeling unusually tired despite a full night’s sleep. If you suspect overnight lows, checking your blood sugar before bed and having a small protein-carb snack when your reading trends low can help prevent them.
Why Blood Sugar Drops in the First Place
For people with diabetes, the most common triggers are too much insulin, a delayed or skipped meal, or more physical activity than usual. Exercise makes your muscles pull glucose from your blood more efficiently, so a workout without adjusting your food intake or medication can cause a low hours later.
Low blood sugar also happens in people without diabetes. Alcohol is a well-known cause: it blocks your liver’s ability to produce new glucose, which is the backup system your body relies on between meals. Drinking on an empty stomach or drinking heavily can push blood sugar dangerously low, especially overnight. Some medications unrelated to diabetes, including certain heart and anti-infection drugs, can also lower blood sugar as a side effect.
Reactive hypoglycemia is another pattern where blood sugar drops two to four hours after eating, often after a meal heavy in refined carbohydrates. The body overproduces insulin in response to the sugar rush, and the overcorrection causes a crash. Eating smaller, more balanced meals with protein and fiber at each sitting tends to smooth this out.
Preventing Lows Before They Happen
Consistent meal timing is one of the simplest defenses. Going long stretches without eating forces your liver to keep up glucose production on its own, and if that system is compromised by medication or alcohol, a low is more likely. Eating regular meals and snacks that include protein, healthy fat, and complex carbohydrates gives your body a steadier fuel supply.
Continuous glucose monitors (CGMs) have changed prevention significantly. These small sensors, worn on the arm or abdomen, track glucose levels every few minutes and can alert you when your blood sugar is trending downward, often before you feel any symptoms. Predictive alerts give you a window to eat something and head off a low before it happens, which is especially useful overnight.
Keeping fast-acting carbs within reach at all times is a practical habit that pays off. A tube of glucose tablets in your bag, your car, your desk drawer, and your nightstand means you’re never caught unprepared. Pairing that readiness with awareness of your personal triggers, whether that’s post-exercise dips, skipped lunches, or evening drinks, gives you the best chance of catching lows early or avoiding them entirely.